Hybrid Organic–Platinum Nanoparticles for Hydrogenation Reactions

Abstract

Hollow organic−inorganic hybrid nanoparticles with expressed catalytic activity in hydrogenation reactions are presented. They are synthesized via a mild reduction of platinum salts with pentaerythritol tetrakis mercaptopropionate (PETMP) in combination with mercaptopropionic acid (MPA) or mercaptosuccinic acid (MSA) in aqueous medium. The reduction of the platinum salts initiates the formation of a disulfide polymer, which attaches to the Pt-nanoparticles, simultaneously leading to hollow hybrid particles with small platinum clusters located on their surface. The catalytic activity of the platinum clusters was demonstrated by the reduction of nitrophenols.

The Shell Matters: Self-Organized CdS-ZnS/MnS-Core-Shell—Porphyrin-Polymer Nano-Assemblies for Photocatalysis

“…Recently, related self-assembled systems have successfully demonstrated their catalytic ability, but those consisted of fewer components [9,29]. Herein, the multicomponent structure target designed for a certain function demonstrates that further complexity can simply be generated by self-assembly in water, representing a key for expanding the scope of other catalytic materials.…”

“…Currently, it is highly desirable to develop concepts that allow their properties to be further tuned for application in photocatalysis as a route to solar energy conversion or to the decomposition of organic pollutants in wastewater. With this motivation, supramolecularly organized catalysts can be of particular advantage because they can be combined into complex composites that perform various functions in a facile and versatile manner [7][8][9]. Fine tuning the optical properties of semiconductor nanoparticles can be achieved by varying the size, ligands, and doping [10][11][12][13][14].…”

Gold Nanoparticles in Disulfide Based Polymer Matrices: Size, Structure and Responsivity

“…The effect on the formation of metal particles and the simultaneous polymer formation were already investigated in earlier studies preparing Pt nanoparticles. [ 18,27 ] At lower pH the stability of the coordination polymers was sufficiently high to prevent the oxidation of both gold and thiol for a longer period of time. This could be further investigated by the time‐dependent UV–vis spectra at different pH values.…”

“…According to the Drude model and Mie theory, the size and environment of the particles can be estimated by the amount and shift of the surface plasmon resonance bands. [4,18,26] The position and amount of the surface plasmon resonance (SPR) bands shift strongly between the different ratios, indicating the impact of the ratio on the PETMP: MPA-based gold nanoparticle structures. For the onestep approach, synthesis A (Figure 4a) multiple or broad bands appear, which can indicate either multiple sizes and shapes or plasmonic coupling amongst proximate particles.…”

“…[ 17 ] This was extended using PtCl 6 2− to replace hydrogen peroxide in the reaction to form uniform Pt nanoparticles in disulfide polymers for the first time. [ 18 ] Herein, the HAuCl 4 will replace hydrogen peroxide as the oxidant to form the disulfide polymer.…”